Linking and updating html babel example

[joseeloren]

I checked that there is a file in public/html/single-file-example.html that is the same in the previous installation post. I think it is better to have on react.dev docs the owning of the file and the capability of changing it. Also, I have checked that now HTML have the W3C standard and also I have updated the CDN links.

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Name	Status	Preview	Comments	Updated (UTC)
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Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌